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Updated: Jun 19, 2026

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Optimized DNA-targeting using triplex forming C5-alkynyl functionalized LNA.

Sujay P Sau1, Pawan Kumar, Brooke A Anderson

  • 1Dept. of Chemistry, Univ. of Idaho, ID-83844, USA.

Chemical Communications (Cambridge, England)
|November 4, 2009
PubMed
Summary
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Modified oligonucleotides show strong binding to DNA targets. These triplex forming oligonucleotides (TFOs) with locked nucleic acid (LNA) monomers offer enhanced stability and precise target recognition.

Area of Science:

  • Oligonucleotide chemistry
  • Molecular biology
  • Biochemistry

Background:

  • Triplex forming oligonucleotides (TFOs) are DNA structures capable of binding to double-stranded DNA (dsDNA) in a sequence-specific manner.
  • Modifications to TFOs are explored to enhance their stability and binding affinity for potential therapeutic applications.
  • Locked nucleic acid (LNA) is a modified RNA nucleotide that increases the binding affinity and stability of nucleic acid duplexes.

Purpose of the Study:

  • To investigate the impact of C5-alkynyl functionalized LNA monomers on the properties of TFOs.
  • To evaluate the thermal affinity of modified TFOs towards dsDNA targets.
  • To assess the specificity and nuclease resistance of the modified TFOs.

Main Methods:

  • Synthesis of TFOs incorporating C5-alkynyl functionalized LNA monomers.

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  • Thermal denaturation studies (Tm assays) to determine binding affinity to dsDNA targets.
  • Assays to evaluate discrimination against mismatched DNA sequences (e.g., Hoogsteen mismatches).
  • Incubation with 3?-exonucleases to assess resistance to degradation.

    • Main Results:

    • TFOs modified with C5-alkynyl LNA monomers exhibited significantly enhanced thermal affinity for dsDNA targets compared to unmodified TFOs.
    • The modified TFOs demonstrated excellent discrimination against Hoogsteen-mismatched dsDNA targets, indicating high sequence specificity.
    • The modified TFOs displayed remarkable stability against degradation by 3?-exonucleases, suggesting improved in vivo persistence.

    Conclusions:

    • C5-alkynyl functionalized LNA monomers are effective modifications for enhancing the performance of TFOs.
    • These modified TFOs possess desirable characteristics for potential applications in diagnostics and therapeutics requiring specific DNA targeting.